Description
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AMIS0647 Au 0.170g/t U 33ppm Wits South Africa
Origin of Material
This standard is made from uranium bearing gold ore originating from the Ventersdorp, Contact Reef, Carbon Leader Reef and Vaal Reef. The uranium bearing ore was blended with low grade material of similar matrix to obtain the required grade.
Approximate Mineral and Chemical Composition
Throughout the Witwatersrand, gold ores occur in sheets or reefs originally deposited horizontally under water. The thickness of the reefs range between a lie of grit to several meters, with an average of 300mm. The sediments were also intersected by dykes and sills of dolomite, diabase and syenite intruding existing faults. The reefs can be in the form of either course conglomerates, rock pebbles and cemented in a silicate matrix. Pebbles usually derived from vein quarts, may also consist of quarzitic, chert jasper and quartz porphyry. The matrix consists of pure silica, but also contains minute flakes of muscovite and pyrophyllite as well as visible pyrite and other sulphides. The gold is usually confined to the matrix and tends to be concentrated along bedding planes (Vermeulen, 2001).
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Analyte Method Certified (µ) (2s) ± Unit
Au Pb Collection1 0.170 0.027 g/t
U 4A_MICP2 33 4 ppm
Moisture Moisture3 0.14 0.02 %
SG SG4 2.72 0.093 Dimensionless
S Combustion/LECO5 0.41 0.04 %
S 4A_MICP 0.42 0.01 %
Al FUS6 2.13 0.18 %
As 4A_MICP 40 4 ppm
Ba 4A_MICP 105 8 ppm
Be 4A_MICP 0.5 0.09 ppm
Bi 4A_MICP 0.4 0.04 ppm
Ca 4A_MICP 2360 155 ppm
Cd 4A_MICP 0.2 0.03 ppm
Ce 4A_MICP 47 6 ppm
Co 4A_MICP 20 2 ppm
Cr FUS 295 14 ppm
Cs 4A_MICP 0.7 0.05 ppm
Cu 4A_MICP 36 3 ppm
Fe 4A_MICP 1.49 0.12 %
Fe FUS 1.51 0.091 %
Ga 4A_MICP 5 0.7 ppm
Hf 4A_MICP 4 2 ppm
K 4A_MICP 4195 232 ppm
La 4A_MICP 24 1 ppm
Li 4A_MICP 5 0.4 ppm
Mg FUS 1565 143 ppm
Mn 4A_MICP 255 19 ppm
Mn FUS 247 40 ppm
Mo 4A_MICP 2 0.5 ppm
Na 4A_MICP 823 127 ppm
Nb 4A_MICP 6 1 ppm
Ni 4A_MICP 48 3 ppm
Pb 4A_MICP 37 3 ppm
Rb 4A_MICP 18 2 ppm
Sb 4A_MICP 3 0.8 ppm
Sn 4A_MICP 1 0.3 ppm
Sr 4A_MICP 25 3 ppm
Ta 4A_MICP 0.7 0.4 ppm
Th 4A_MICP 12 3 ppm
Ti 4A_MICP 1281 180 ppm
Ti FUS 1648 152 ppm
Tl 4A_MICP 0.2 0.04 ppm
V 4A_MICP 20 1 ppm
Y 4A_MICP 7 2 ppm
Zn 4A_MICP 67 6 ppm
